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English definition of “double-blind”

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double-blind

adjective uk   /ˌdʌb.l̩ˈblaɪnd/ specialized us  
A double-blind study or trial, especially in medicine, is one in which two groups of people are studied, for example with one group taking a new drug and one group taking something else, but neither the people in the study nor the scientist or doctor knows which person is in which group.
(Definition of double-blind from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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